W3C home > Mailing lists > Public > public-rif-wg@w3.org > March 2010

Re: Importing RIF documents from RDF - last attempt

From: Sandro Hawke <sandro@w3.org>
Date: Fri, 12 Mar 2010 09:44:52 -0500
To: Ivan Herman <ivan@w3.org>
cc: Chris Welty <cawelty@gmail.com>, Axel Polleres <axel.polleres@deri.org>, RIF <public-rif-wg@w3.org>, Birte Glimm <birte.glimm@comlab.ox.ac.uk>, Chimezie Ogbuji <ogbujic@ccf.org>
Message-ID: <22696.1268405092@waldron>
> This is a cryptographically signed message in MIME format.
> 
> --------------ms000108000304070208050108
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> 
> Chris, I understand.
> 
> The issue we have is that this statement, if defined somewhere, is
> really not SPARQL specific only. Is it o.k. with the RIF group if the
> URI used for those predicates are in the RIF namespace somehow?
> Alternatively, we can mint a completely separate URI.

I think we could get a RIF WG resolution in support of it, possibly in
the form of approving a review of the SPARQL ENT document, and that
would be procedurally sufficient.

    -- Sandro

> Ivan
> 
> On 2010-3-12 15:09 , Chris Welty wrote:
> >=20
> > Axel,
> > I really really really do not understand why it matters whether RIF
> > specifies this or SPARQL.
> > RIF should be viewed as read-only right now unless there is an error.
> >=20
> > -Chris
> >=20
> > Axel Polleres wrote:
> >> Hi all,
> >>
> >> We had the topic of "rif:imports" coming up in SPARQL again in our
> >> Entailment regimes taskforce call this week.
> >>
> >> The reason why we (from the SPARQL side) would prefer to have that
> >> imports mechanism defined in RIF,
> >> is mainly that we think that the URIs to use for defining this imports=
> 
> >> mechanism should be in  the rif: namespace, since this imports
> >> mechanism is likely useful not only for SPARQL but also for other
> >> RDF applications that wnat to interact with RIF.
> >>
> >> Thus, I wanted to inquire again, whether we'd have a chance to get
> >> that an import mechanism for RIF from RDF into
> >> http://www.w3.org/TR/rif-rdf-owl/ ?
> >>
> >> If the group overall still thinks that it is too late to get this into=
> 
> >> the spec, in turn, I wanted to ask/raise again how/whether we could
> >> proceed to publish this text as a WG Note?
> >>
> >> I have earlier made a simple proposal to add a new section to the
> >> current spec, which we elaborated a bit now:
> >>
> >> 1) In the introduction of http://www.w3.org/2005/rules/wiki/SWC,
> >> I would suggest to add:
> >>
> >> "RDF Graphs in RIF-RDF-combinations are assumed to not contain any
> >> triples using the predicates
> >> rif:imports, rif:ruleset and rif:profile we refer to Section 6 for
> >> treatment of such graphs.
> >> "
> >>
> >> 2) Further, I would suggest to add a new section:
> >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >>
> >>
> >> =3D 6 Importing RIF rulesets in RDF =3D
> >>
> >> The definitions so far, only covered RIF-RDF-combinations where the
> >> RDF graphs did not contain
> >> triples using rif:usingRuleset in predicate positions. To lift this
> >> restriction, we define
> >> RIF-X-combinations (R,S) where any of the graphs in S contains triples=
> 
> >> with the predicates
> >> rif:imports, rif:ruleset and rif:profile
> >> by a reduction to combbinations without such triples as follows.
> >>
> >> Let (R, S) be a combination as above. The reduction of R is defined as=
> 
> >> the
> >> RIF-X-combinations (R', S') where
> >>  (i) S' is identical to S with all rif:imports, rif:ruleset and
> >> rif:profile triples removed,      and
> >>  (ii) R' is identical to the RIF document R,
> >>       with the addition that R' has additional imports clauses
> >>       Imports( R1 )
> >>       Imports( G P )
> >>      for any triples
> >>
> >>        <> rif:imports [rif:ruleset R rif:profile P ].
> >>
> >>      in (simple entailed by) S, such that R1 is an IRI referring to a
> >> RIF document and
> >>      P is a URI referring to an imports profile as defined in
> >>      Section http://www.w3.org/2005/rules/wiki/SWC#Profiles_of_Imports=
> 
> >>
> >> Together with the conditions in section 5.2 this ensures that
> >> RIF-X-combinations where R is empty, i.e. which
> >> are only defined by a set of RDF graphs, can also import RIF rulesets.=
> 
> >>
> >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >>
> >>
> >> In case there is a chance to get this on one of the next agendas,
> >> please let me know, since I have recently not
> >> really had time to be follow the RIF TCs, but I'd be joining for that.=
> 
> >>
> >> best,
> >> Axel
> >>
> >> P.S.: Condition (i) which removes all the rif:usingruleSet triples, i.=
> e.,
> >> just treats these triples as a directive rather than part of the
> >> graph, may be dropped, i.e. simply keeping S as is, accepting the
> >> rif:imports, rif:ruleset and rif:profile triples as part of the graph.=
> 
> >>
> >=20
> 
> --=20
> 
> Ivan Herman, W3C Semantic Web Activity Lead
> Home: http://www.w3.org/People/Ivan/
> mobile: +31-641044153
> PGP Key: http://www.ivan-herman.net/pgpkey.html
> FOAF   : http://www.ivan-herman.net/foaf.rdf
> vCard  : http://www.ivan-herman.net/HermanIvan.vcf
> 
> 
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